QGIS/resources/function_help/json/$currentfeature

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{
"name": "$currentfeature",
"type": "function",
"description": "Returns the current feature being evaluated. This can be used with the 'attribute' function to evaluate attribute values from the current feature.",
"examples": [
{ "expression":"attribute( $currentfeature, 'name' )", "returns":"value stored in 'name' attribute for the current feature"}
]
}